public class Mianji {
    public static void main(String[] args) {
        int num =lcy(5,5);
        double num1 =lcy(5.5,6.6);
        System.out.println(num);
        System.out.println(num1);
    }
    public static int lcy (int x,int y){
        return  (x*y)/2;
    }
    public  static double lcy (double x,double y){
        return (x*y)/2;
    }
}
